Twelfth Night: Olivia Olivia, in Twelfth Night, is the character who unifies the play by her involvement in each of the three plots. Olivia is loved by Orsino, but she loves Cesario. Olivia plays a vital role in the plot to gull Malvolio, although she is unaware of it. Olivia also has an active role in the plot to dupe Sir Andrew because he is jealous of her attention towards Cesario. In conlusion Olivia is the one who inifies the play the best. Olivia is involved the the love plot more then any other plot in which she is involved in. Olivia is loved by others, and she is also in love with others. Th